Please educate me about this format.
I took pictures in a museum I visited last weekend and I compared the 5mp .jpeg files to the "supposedly" 16mp .dng files.

I used FastStone to view my .dng pics.
The .dng file showed that it takes 20.5mb of space but the dimensions show that it is 2688 x 1512
On the other hand my 5mp jpeg picture takes 1.16mb of space but dimensions show 3072 x 1728 (4.06mp) 24 bit

First... I'm going to state I'm NOT a dng "expert." I'm just starting down the road of dng use and manipulation.

My understanding is the dng is (raw) sensor data from the camera. But any software that looks at it is going to "frame" some of that data as pixels to use for a reference point. Editing then sifts through the data and applies stored aspects of the imaging data...